chore(deps): update dependency environs to v7

[renovate]

This PR contains the following updates:

Package	Update	Change
environs	major	~=4.2.0 -> ~=7.3.0
environs	major	==4.2.0 -> ==7.3.0

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Release Notes

sloria/environs

v7.3.0

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• log_level accepts lower-cased log level names and rejects invalid
  names (#​138).
  Thanks gnarvaja for the PR.

v7.2.0

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• Add dj_cache_url for caching Django cache URLs (requires installing with [django])
  (#​126).
  Thanks epicserve for the suggestion and PR.

v7.1.0

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• Improve typings and run mypy with dependencies type annotations (#​115).
• Distribute types per PEP 561 (#​116).

Thanks hukkinj1 for the PRs.

v7.0.0

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• Backwards-incompatible: Remove stream argument from read_env,
  since it had no effect (#​114).
• Backwards-incompatible: Env.read_env consistently returns None
  (#​111).
• Remove unnecessary __str__ definition (#​112).

Thanks hukkinj1 for the PRs.

v6.1.0

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Features:

• Add deferred validation via the eager parameter and env.seal() (#​56).
  Thanks robertlagrant for the suggestion.

Other changes:

• Test against Python 3.8 (#​108).

v6.0.0

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In <6.0.0, this would override the built-in method.

v5.2.1

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Bug fixes:

• Fix behavior when recursively searching for a specified file
  (#​96).
  Thanks ribeaud for the catch and patch.

v5.2.0

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Changes:

• Improve typings.

v5.1.0

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Features:

• Add env.log_level (#​7).
• Use raise from to improve tracebacks.

Other changes:

• Improve typings.

v5.0.0

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Features:

• Add env.path (#​81).
  Thanks umrashrf for the suggestion.
• Add type annotations.

Other changes:

• Backwards-incompatible: Drop support for Python 2. If you use Python 2,
  you will need to use version 4.2.0 or older.

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